Shock absorber



T. SARRI 1,833,596

SHOCK ABSORBER Nov. 24, 1931.

5 Sheets-Sheet 1 Filed Dec. 25, 1929 Z Irweniar:

j I 110% Sarrl' Z7 P m T. SARR] SHOCK ABSORBER Nov. 24, 1931.

5 Sheets-Sheet 2 Filed Dc.

Z g. m

grainy/Ill!!! T. SARRI Ndv. 24, 1931.

SHOCK ABSORBER Filed Dec. 25. 1929 3 Sheets-Sheet 3.

Invmr: Iain-"200%? Sarr, @W 6% Patented, Nov. 24, 1931 comm STATES ENT F C mommiro SARRI, of PARIS, FRANCE,

snocx ABSORBER Application filed December 23, 1929, Serial No. 416,096, and in France July 12, 1929.

I The present invention relates to shockabsorbers of the type adapted to beused on bicycles,'automobiles and the like and more especially, on vehicles provided with springs. One of the objects of the invention is to provide a form of shock absorber which may be easily assembled and adjusted and which reacts easily to small shocks. Another object is to provide a shockabsorber whose action increases with the amplitude ofthe displacing shock.

' Further objects'will appear in the course of the detailed description now to be given with reference to the accompanying drawings, in which Fig. l is an elevation of one illustrative embodiment of the invention;

Fig. 2 is an end-view of the structure represented in Fig. 1;

Fig. 3'is a section taken on line 3 3 of Fig. 2;

Figs. 4 and 5 represent, diagrammatically, I the shock-absorber represented in Figs. 1 to 3 f at two different stages in the operation thereof;

Fig. 6 illustrates, in partial section, a special form of shock-absorber designedto vary the resistance with the amplitude of the shock; i

Fig. 7 shows the structure represented in Fig. 6 at a different stage in its operation.

Fig. 8 is a view similar to that of Fig. 2'

Y showing a shock absorber of the type having surfaces like those in Figs. 6 and 7.

Referring to Figs. 1 to 5 of the drawings, there is shown an arm a connected at one extremity to a chassis c,a pair of arms b 6 positioned on opposite sides of arm a and connected to a spring d, supporting chassis 0, said arms having radially corrugated sur faces e and f of sine-curve or similar trigo' nometric form (Figs. 2 and 3) on theside of each facing arm (aea radially corrugated disc a positioned between surfaces 6 and f and having surfaces e, f formed so that the summits thereof coincide with those of e and f ,a pair of annular branches at integral with, or rigidly connected to, arm a and embracing disc a said branches being provided 1:50 with a bolt 0 adapted to force the latter into gripping'relation with disc a a bolt 71 prowith oneanother, element a1 may be formed ofordinary'whitecast iron, while elements b end 6 may bemade of malleable cast iron, the contacting portions-of b1 and 12 being machined and polished to reduce the friction therebetween. If desired, thin, flexible, washers 1 it formed of nickel-chromium or silico-manganese steel, or even of highly compressed fiber and having a low' coefficient of friction may be interposed between 6 f and 7 e f toprevent rapid wear.

The device is assembled, and operates, in the following manner r The vehicle being at rest and the various operative elements being loosely assembled, 75 disc (1 is adjusted so that the summits of the corrugations of surfaces 6 and 7 lie opposite the corresponding summits of 6 7. Bolt 0 is then tightened to rigidly fix' elements a and a relatively to oneanother and 3 nut Z'is taken upso as to bring surfaces 6 f and'e f into forcible contactwith one another under the resilient action of Belleville discs 7'. When the vehicle is on the road and the Wheels enter a hole or encounter a 5 protuberance, surfaces 6 f and e f will suffer an angular displacement relatively to one another and, under'the compressive action of discs j,w-ill move towards one another from the position shown in Fig. i-to that 96 shown in'Fig. 5. It can be shown that, if the compression of discsv j be sufficient to compensate for variations in the elastic effect exerted by spring d, the angular displacement ofpoint of contact B (Fig. 4) toposition A (Fig. 5) is proportional-to the relativeangular displacements of'arms a and b b. :If the-wheel enters a depressioninthe road,arms a and b b will move away from one another and the summits of e ,'f will 100 move towards the troughs of 6 f i. e. wheels will be aided in moving downward into con tact with the ground, while the chassis continues its horizontalcourse. At the moment that the chassis begins to follow the wheel downward, its-rate of descent is diminished by the movementof the inclined portions of e f and 6 f .over'one another, the: latter acting to oppose diminution of the angle be:

tween arms a and b 6 The same analysis,

in inverse form, applies to the case where the wheel encounters a protruding ineqi 1ality.in. i

the road.

with one another.

testimonywhereof, I afii'x my signature.

"*"Iii. TOMMATO SARRI.

The modified forms of surface shown Figs. 6 and? are designed to offer an aug- -mented resistance to displacements of large amplitude taking place in a-short interval of time-(case-of a vehicle moving rapidly over a very rough road). Here,'disc a (Figs. 1, to

5) is. eliminated'and two arms-a andb are 7' provided" with interengageable 1 surfaces .6

and '6 formed t'o presenta flattened toppor- Y tion of large curvature, lateral portions-10f gradually increasing curvature, and 'termie nal'rflatportionse? offering a' greatlyiaug- .mented resistan'ce,;when in engagementito relative: angular displacement of' surfaces 6? .and c VShock;absorbers-ofthis type;when

in equilibrium 'ig. 6), offer. alvery small resistance to-angular displacement on .ac-

count. of the flattened tops of theircorrugations, but oncendisplaced into the position shown in Fig. 7 resist rapid-displacementin either direction; Obviously, discs similarzto a (FigsQ-lto 5'). and having corrugations of the form shown in Figs. (iand 7 may be mounted between similarly shaped surfaces i (Fig. 8) formed on-apairof arms corresponding to I6 11 discs ofthe type 7t. already described being interposed between frictionf ally engaging surfaces re and, Q6 desired. 5 The inventor is aware ofthe exlsta-nce of devices in which a. pair of corrugated surfaces the in substantially continuous contact with one another when theshock-absorber is in equilibrium position, but he. is not awa re of any in which, .as in Figs 6, 7 and 8*, only the most elevated portion-s: ofthe corrugations are" in contact in this position. Obviously,

.themodeof operation of devices of these two types is very different; Intheiformer, the

resistance. to displacement-is.at-a-maximum for positions just adJace-nttheequilibrium position, in the. latter the converseistrue. .Q 1

In a vehicle-,a' chassis,.a 'springzsups porting said chassis+and a shock absorbing I isystem ada'pted to react upon said-springand s 1 chassisand comprisinga pair-of pivotallyen gaging arms mou-ntedto form an angle with onewanother which varies wit11,ana by,-rel'- I ative. displacements ofythe springand ofthe chassis, one of said arms being 1 provided with meansifortgrippi'ng a disc, theother of i'said arms-being provided with acurved su'r- 

